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README.md

Purpose

Simplify getting some basic statistics about content of AWS S3 buckets, that are missing or not very convenient to use in AWS CLI. Supports the following commands:

Command Description
cat Print content of S3 file(s) to stdout
help Help about any command
lock Manage object locks
logs Print S3 access logs as JSON
ls List versions and/legal holds and locks
parquet Parquet files explorer
size Calculate size of S3 location
tag Tag S3 object(s)

Could be quite useful for a fellow data engineer.

Build / install

Sources

go install

MacOS

brew tap jdevelop/s3kit
brew install s3kit

Binary release

Usage

AWS S3 command line toolkit

Usage:
  s3kit [command]

Available Commands:
  cat         Print content of S3 file(s) to stdout
  help        Help about any command
  lock        Manage object locks
  logs        Print S3 Access logs as JSON
  parquet     Parquet files explorer
  size        Calculate size of S3 location

Flags:
      --debug         print debug messages
  -h, --help          help for s3kit
      --quiet         print warnings and errors
  -w, --workers int   number of concurrent threads (default 12)

Use "s3kit [command] --help" for more information about a command.

s3kit cat

Often you want to view content of a file on S3, or perhaps all of them in a certain path. If we're considering data engineering - often these files are represented as compressed CSV files. There's no easy way to view the file, so basically the cat command can identify the file ( by extension ) and uncompress it to stdout.

Print content of S3 file(s) to stdout

Usage:
  s3kit cat s3://bucket/key1 s3://bucket/prefix/ ... [flags]

Flags:
  -h, --help   help for cat

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

Example

s3kit cat s3://bucket/path will print out content of all files under path prefix s3://bucket/path

s3kit logs

Logs command will take the folder/file that contains the access logs for a static website hosted on an S3 bucket.

Print S3 Access logs as JSON

Usage:
  s3kit logs s3://bucket/key1 s3://bucket/prefix/ ... [flags]

Flags:
  -e, --end Date     end date ( YYYY-MM-DD ) (default 2020-04-18 20:00:00 -0400 EDT)
  -h, --help         help for logs
  -s, --start Date   start date ( YYYY-MM-DD ) (default 0001-01-01 00:00:00 +0000 UTC)

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

Example

s3kit logs s3://logs-bucket/accesslog/

It will print JSON objects ( one per line ) as:

{
  "time": "2020-04-13T13:27:30Z",
  "remote_ip": "103.249.100.196",
  "operation": "WEBSITE.GET.OBJECT",
  "key": "web/wp-includes/wlwmanifest.xml",
  "request_uri": "GET /web/wp-includes/wlwmanifest.xml HTTP/1.1",
  "http_status": 403,
  "bytes_sent": 303,
  "object_size": 0,
  "flight_time": 59000000,
  "turnaround_time": 0,
  "referer": "-",
  "user_agent": "-"
}

With jq it is quite easy to get top IP addresses that visited the website:

logs s3://logs-bucket/accesslog/ | grep "WEBSITE.GET.OBJECT" | jq ".remote_ip" | sort | uniq -c | sort -n

s3kit size

Getting size of a bucket / path prefix can be achieved with aws s3 ls --summarize, however it doesn't have the functionality to collect size of the top-level folders under S3 prefix, which might be useful.

Calculate size of S3 location

Usage:
  s3kit size  s3://bucket/key1 s3://bucket/prefix/ ... [flags]

Flags:
  -g, --group   group sizes by top-level folders
  -h, --help    help for size
      --json    output as JSON array
      --raw     raw numbers, no human-formatted size

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

Example

s3kit size s3://dataeng-data/ -g
+--------------------------------+-------+--------+
|              PATH              | COUNT |  SIZE  |
+--------------------------------+-------+--------+
|  s3://dataeng-data/categories/ |    17 | 62 kB  |
|  s3://dataeng-data/meetups/    |    18 | 15 MB  |
|  s3://dataeng-data/members/    | 96599 | 8.2 GB |
+--------------------------------+-------+--------+
|             TOTAL:             | 96634 | 8.2 GB |
+--------------------------------+-------+--------+

It is also possible to get JSON output:

[
  {
    "Path": "s3://dataeng-data/categories/",
    "Count": 17,
    "Size": 61684
  },
  {
    "Path": "s3://dataeng-data/meetups/",
    "Count": 18,
    "Size": 15408356
  },
  {
    "Path": "s3://dataeng-data/members/",
    "Count": 96599,
    "Size": 8202309787
  }
]

s3kit lock compliance

Adds the compliance lock to a given object identified by a prefix and applicable to all versions of the object(s), latest version of the object(s) or specific version of the object(s).

Add compliance lock

Usage:
  s3kit lock compliance s3://bucket/key1 s3://bucket/prefix/ ... [flags]

Flags:
      --all               Apply to all versions of object(s)
      --expire duration   compliance lock duration (1m, 1h etc)
  -h, --help              help for compliance
      --latest            Apply to latest version of object(s) (default true)
      --version string    Apply to a specific version

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

This operation will explicitly ask for confirmation prior to applying to the object version, because there's no way to revert the compliance lock:

s3kit lock compliance s3://demolocal123/go.mod --expire 10s
Locking s3://bucket/key version .oNOa6ZVNDTUcKHaaaECJUmdA9XaBTI4 expires 2020-04-18 15:31:35, proceed? (y/N):

The default answer is NO.

s3kit lock legal add / rm

Adds or removes the legal hold to the object(s) found by given S3 prefix(es).

Add/remove legal hold

Usage:
  s3kit lock legal [command]

Available Commands:
  add         Add legal hold for given object(s)
  rm          Remove legal hold for given object(s)

Flags:
      --all              Apply to all versions of object(s)
  -h, --help             help for legal
      --latest           Apply to latest version of object(s) (default true)
      --version string   Apply to a specific version

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

Use "s3kit lock legal [command] --help" for more information about a command.

s3kit lock governance add / rm

Adds or removes the governance retention lock to the object(s) found by given S3 prefix(es).

Add/remove governance lock

Usage:
  s3kit lock governance [command]

Available Commands:
  add         Add governance lock for given object(s)
  rm          Remove governance lock for given object(s)

Flags:
      --all              Apply to all versions of object(s)
  -h, --help             help for governance
      --latest           Apply to latest version of object(s) (default true)
      --version string   Apply to a specific version

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

Use "s3kit lock governance [command] --help" for more information about a command.

s3kit parquet schema

Print parquet files schema

Usage:
  s3kit parquet schema s3://bucket/prefix/key s3://bucket/prefix/ ... [flags]

Flags:
  -h, --help       help for schema
      --json       JSON output
      --keys int   max parquet files to process (default 1)

Global Flags:
  -w, --workers int   number of concurrent threads (default 12)

s3kit ls locks

List various locks on S3 object(s) (legal hold, governance/compliance retention)

Usage:
  s3kit ls locks s3://bucket/folder/ s3://bucket/folder/prefix ... [flags]

Flags:
      --all              Apply to all versions of object(s)
  -h, --help             help for locks
      --latest           Apply to latest version of object(s) (default true)
      --version string   Apply to a specific version

Global Flags:
      --json          JSON output
      --table         ASCII table output (default true)
  -w, --workers int   number of concurrent threads (default 12)
      --yaml          YAML output

s3kit ls tags

List tags for object(s)

Usage:
  s3kit ls tags s3://bucket/folder/ s3://bucket/folder/prefix ... [flags]

Flags:
      --all              Apply to all versions of object(s)
  -h, --help             help for tags
      --latest           Apply to latest version of object(s) (default true)
      --version string   Apply to a specific version

Global Flags:
      --json          JSON output
      --table         ASCII table output (default true)
  -w, --workers int   number of concurrent threads (default 12)
      --yaml          YAML output

s3kit ls versions

List object version(s)

Usage:
  s3kit ls versions s3://bucket/folder/ s3://bucket/folder/prefix ... [flags]

Flags:
  -h, --help   help for versions

Global Flags:
      --json          JSON output
      --table         ASCII table output (default true)
  -w, --workers int   number of concurrent threads (default 12)
      --yaml          YAML output

s3kit tag add

Add tag(s) to S3 object(s)

Usage:
  s3kit tag add s3://bucket/folder/ s3://bucket/folder/prefix ... [flags]

Flags:
  -h, --help           help for add
      --tags strings   tags as --tags 'tag1=value1,tag2=value2' or multiple --tags ... options

Global Flags:
      --all              Apply to all versions of object(s)
      --latest           Apply to latest version of object(s) (default true)
      --version string   Apply to a specific version
  -w, --workers int      number of concurrent threads (default 12)

s3kit tag rm

Remove tag(s) from S3 object(s)

Usage:
  s3kit tag rm s3://bucket/folder/ s3://bucket/folder/prefix ... [flags]

Flags:
  -h, --help           help for rm
      --tags strings   tags as --tags 'tag1,tag2' or multiple --tags ... options

Global Flags:
      --all              Apply to all versions of object(s)
      --latest           Apply to latest version of object(s) (default true)
      --version string   Apply to a specific version
  -w, --workers int      number of concurrent threads (default 12)
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